When the temperature gets and stays below freezing, I recommend that you run some polypropylene thru your engine. It's cheap ($3 or $5/gal) compared to freeze damage. It's your boat and you have to decide.
I like Ted's belt and suspenders. When I winterize (on the hard) I drain the heat exchanger, because I pull out the old zinc and replace it in the fall. I'm going to replace it in the spring so why not in the fall and let everything(antifreeze/water) drain out. I also take the impeller out of the pump and spray it with silicon. No sense in leaving it all scrunched up for the winter. At the same time I take off the drive belt. Why have it tensioned all winter and I turn it around in the spring ( to get even wear from slight misalignment of the pulleys).
A few thoughts.
I like Ted's belt and suspenders. When I winterize (on the hard) I drain the heat exchanger, because I pull out the old zinc and replace it in the fall. I'm going to replace it in the spring so why not in the fall and let everything(antifreeze/water) drain out. I also take the impeller out of the pump and spray it with silicon. No sense in leaving it all scrunched up for the winter. At the same time I take off the drive belt. Why have it tensioned all winter and I turn it around in the spring ( to get even wear from slight misalignment of the pulleys).
A few thoughts.